It is narrated from Hazrat Nu'man bin Bashir (may Allah be pleased with him) that I heard with my own ears the Holy Prophet (peace and blessings be upon him) saying: "The lawful is clear and the unlawful is clear, and between them are doubtful matters. Whoever leaves these doubtful matters will easily be able to avoid the unlawful. And the sanctities of Allah are His pastures, and whoever grazes his animals around the pasture is at risk of entering into it."